Five pair of zebra ovaries were submitted to the Onderstepoort Veterinary Research Institute for examination because of unusual uni- and/or bilateral gross appearances. Microscopic findings revealed an accessory spleen ...

The immunogenicity of a number of avirulent rough Salmonella dublin mutants was compared in mice and guinea-pigs. Live vaccine prepared from Strain HB 1/17 at doses of 5 x 10⁷ per mouse usually gave an immunity of between ...

The literature on the various disease syndromes caused by chlamydia in domestic and laboratory
animals is summarized. A review of the pathological lesions which characterize these diseases is
presented and the pathogenesis ...

An electron microscopic study of structures suspected to represent a possible developmental cycle of Cowdria ruminantium in reticulo-endothelial cells of mice and ruminants is reported. After infection dense bodies increase ...

Mice, exposed to the effects of the oral secretion of Ornithodorus savignyi by injection, revealed that a potent toxin is present in the secretion. Electrophoretic and chromatographic separations of the secretion showed a ...

The percutaneous (leg and thorax and abdomen) and subcutaneous routes of infestation with Schistosoma mattheei were compared in 29 sheep. Larger percentages of cercariae developed after percutaneous than subcutaneous ...

The filarial worm Parafilaria bovicola causes streaks of blood on the skins of live cattle and slimy bruise-like lesions on the subcutaneous surfaces of their carcases. To determine the vectors of this worm a field survey ...

Ixodes (Afrixodes) drakensbergensis n. sp., is described from females, males, nymphs and larvae
collected on a drag at Giant's Castle Nature Reserve, Natal, Republic of South Africa; it was also
taken from an eland in ...

The protozoan parasites of wild birds from the vicinity of Onderstepoort are recorded. New host records for the Republic of South Africa are: Haemoproteus in Threskiornis aethiopicus, Francolinus swainsonii, Columba guinea ...

A rapid spectrophotometric method for the monitoring of embryonic development in Boophilus decoloratus (Koch, 1844) is described. The method is based on a quantitative assessment of guanine, the principal end-product of ...

With this adjustable apparatus sheep aged from five months to five years and varying in mass from 16-95 kg could be restrained effectively. Cercarial suspension was spilt by only 2/44 sheep during infestation with Schistosoma ...

Dietary, breeding and clinical histories and pathological findings are presented from 2 confirmed and 5 presumed cases of vitamin A deficiency in immature African lions. Five of the 7 animals were born in the wild while 2 ...

Blood smears from a total of 282 wild Bovidae from Ngamiland, Botswana were examined for the presence of blood parasites. The following species were sampled: 190 African buffalo, 23 impala, I0 blue wildebeest, 18 tsessebe, ...

Sections of the spleen, thymus, lymph nodes and liver, collected from mice at various time intervals after injection with either steroid hormones only, sheep red blood cells (SRBC) only, or SRBC plus steroid hormones, were ...

Hepatozoonosis was studied in hyaenas, lions, jackals, cheetahs and one leopard in the Kruger National Park and compared with the condition seen in dogs in the Republic of South Africa. Hepatozoon schizonts were found in ...

A report is given on the helminths collected from 4 bontbok, Damaliscus dorcas dorcas, which
died following capture at the Bontebok National Park, Swellendam, and transfer to the National
Zoological Gardens, Pretoria. ...

It was shown that Clostridium perfringens epsilon toxin has the effect of allowing the passage
of ¹²⁵I polyvinyl-pyrrolidone and ¹²⁵I human serum albumin into mouse brain. These substances did
not enter the brains of ...

An outbreak of ringworm in Karakul sheep occurred during 1973 among the flocks of at least 14 farmers in South West Africa and the Northern Cape Province. Infections spread from one farm to another as a result of introducing ...

An outbreak of amaurosis and paresis was observed amongst sheep, and occasionally cattle, which had been grazing on pastures consisting mainly of Helichrysum argyrosphaerum DC. A similar syndrome was produced by feeding ...